What is the Nernstian slope in potentiometric analysis of Ca2+ when Ecell (mV) is plotted against pSr? +29.6 mV per ionic unit -29.6 mV per ionic unit -59.2 mV per ionic unit +59.2 mV per ionic unit
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- The difference in chemical potential of a particular substance between two regions of a system is −8.3 kJ mol−1. By how much does the Gibbs energy change when 0.15 mmol of that substance is transferred from one region to the other?Salt Concentration (%) Transmittance (%) 0 77.23 3 79.23 6 80.39 9 82.71 12 85.66 15 87.55 What is the dependent variable and the independent variable? what patterns do you observe based on the information in the table?Does the equation Vmax = kcat * [Et] only apply to steady state conditions, and not pre steady state conditions?
- What would be the free-energy change generated by the import of one mole of Na+ from a concentration of 10 mM to 150 mM with a membrane potential of −25 mV at 37°C? Give your answer without units and to one decimal place. F = 96.5 kJ/V•molGiven the following information calculate the concentration of caffeine for the blank, standards 1-7, and the sample....what is the property of the solution that makes log(concentration) Vs electrochemical potential deviates from linear line at high concentrations?
- Graphically derive the value of KM from a Michaelis-Menten PlotFor ferrocene (C10H10Fe) the enthalpy of sublimation is 73.2 kJ/mol and the entropy of sublimation is 243 J/mol.K. What is the sublimation temperature of ferrocene in degrees Celsius?The concentration ofacetylcholine (a neurotransmitter) in a sample can be determined from the pH changes thataccompany its hydrolysis. When the sample is incubated with the enzymeacetylcholinesterase, acetylcholine is converted to choline and acetic acid, whichdissociates to yield acetate and a hydrogen ion: In a typical analysis, 15 mL of an aqueous solution containing an unknown amount ofacetylcholine had a pH of 7.65. When incubated with acetylcholinesterase, the pH of thesolution decreased to 6.87. Assuming there was no buffer in the assay mixture, determinethe number of moles of acetylcholine in the 15 mL sample.
- If the osmotic pressure of a 7.96×10-2-M aqueous solution of Fe2(SO4)3 was found to be 8.71 atm at 20°C, what would be the "observed" van't Hoff factor? Use the above van't Hoff factor to predict the freezing point of this solution.Note that the corresponding molality would be 8.25×10-2 m, given that the density of the solution is 0.997 g/cm3. °C Use the above van't Hoff factor to predict by how many degrees the boiling point of this solution will be elevated above that for pure water.An analysis of city drinking water for total hardness was done by two students in the laboratory and produced the following results (in ppm CaCO3): Student A: 228.3, 226.4, 226.9, 227.1, and 228.6. Student B: 229.5, 226.1, 230.7, 223.8, and 227.5 1. Calculate the following for each data set: (proper significant figures, neglect units) a) Mean for student A b) Mean for student B c) Relative standard deviation for student A d) Relative standard deviation for student B e) Confidence Level for Student A at 95% (write as a range for example: 200-300) f) Confidence Level for Student B at 95% (write as a range for example: 200-300) g) Which of the student have a more precise result? (write STUDENT A or STUDENT B)why is there a difference between the stock solution concetration of chymotrypsin calculated from zero time y intercepts versus the stock solution label information?